Husqvarna 445, 445e, 450e manual General Safety Precautions, Chain drive sprocket

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Chain drive sprocket

GENERAL SAFETY PRECAUTIONS

Chain drive sprocket

The clutch drum is fitted with one of the following drive sprockets:

ASpur sprocket (the chain sprocket is welded on the drum)

BRim sprocket (replaceable)

Regularly check the degree of wear on the drive sprocket. Replace if wear is excessive. Replace the drive sprocket whenever you replace the chain.

Needle bearing lubrication

Both versions of sprockets have a needle bearing on the drive shaft, which has to be greased regularly (once a week). CAUTION! Use a high-quality bearing grease or engine oil.

See instructions under the heading Maintenance, Needle bearing lubrication.

Checking wear on cutting equipment

Check the chain daily for:

Visible cracks in rivets and links.

Whether the chain is stiff.

Whether rivets and links are badly worn.

Replace the saw chain if it exhibits any of the points above.

We recommend you compare the existing chain with a new chain to decide how badly the existing chain is worn.

When the length of the cutting teeth has worn down to only 4 mm the chain must be replaced.

16 – English

Bar

Check regularly:

Whether there are burrs on the edges of the bar. Remove these with a file if necessary.

Whether the groove in the bar has become badly worn. Replace the bar if necessary.

Whether the tip of the bar is uneven or badly worn. If a hollow forms on the underside of the bar tip this is due to running with a slack chain.

To prolong the life of the bar you should turn it over regularly.

WARNING! Most chain saw accidents

!happen when the chain touches the operator.

Wear personal protective equipment. See instructions under the heading Personal protective equipment.

Do not tackle any job that you feel you are not adequately trained for. See instructions under the headings Personal protective equipment, How to avoid kickback, Cutting equipment and General working instructions.

Avoid situations where there is a risk of kickback. See instructions under the heading Machine′s safety equipment.

Use the recommended protective equipment and check its condition. See instructions under the heading General working instructions.

Check that all the chain saw safety features are working. See instructions under the headings General working instructions and General safety precautions.

115 10 81-26 Rev.2 2008-01-11

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Contents Operator′s manual 445 445e 450eSymbols on the machine KEY TO SYMBOLSSymbols in the operator’s manual CONTENTS ContentsINTRODUCTION Dear CustomerWHAT IS WHAT? What is what on the chain saw?GENERAL SAFETY PRECAUTIONS Before using a new chain sawMachine′s safety equipment Always use common sensePersonal protective equipment Chain brake and front hand guard8 – English Throttle lockout Stop switch Right hand guardVibration damping system MufflerGeneral rules Cutting equipmentCutting equipment designed to reduce kickback General information on sharpening cutting teeth WARNING! Departure from thesharpening instructions considerably increases the risk of kickbackGeneral advice on adjusting depth gauge setting increased if the depth gauge setting isAdjustment of depth gauge setting Tensioning the chain445e, 450e Lubricating cutting equipment which could lead to serious, even fatal injuriesChain oil Filling with chain oilChain drive sprocket ASSEMBLY Fitting the bar and chainFitting a spike bumper FUEL HANDLING FuelFuel safety FuellingTransport and storage Long-termstorageSTARTING AND STOPPING Starting and stoppingStopping Before use WORKING TECHNIQUESGeneral working instructions 24 – English Basic cutting technique 12 3 Tree felling techniqueFelling direction Clearing the trunk and preparing your retreatFelling Directional cutsFelling cut What is kickback? How to avoid kickbackFreeing a tree that has fallen badly Limbing WARNING! A majority of kickback Carburettor adjustment MAINTENANCEGeneral Checking the brake trigger Checking the inertia brake releaseimmediately Muffler Replacing the starter cord StarterTensioning the recoil spring Replacing the return and drive springs Air filterFitting the starter Spark plug Lubricating the bar tip sprocketNeedle bearing lubrication Cooling systemWinter use ”Air Injection” centrifugal cleaningTemperature -5Cor colder Maintenance schedule Daily maintenanceWeekly maintenance Monthly maintenanceTECHNICAL DATA Technical dataBar and chain combinations Saw chain filing and file gaugesLength, inch Pitch, inchEC-declarationof conformity Applies to Europe only´z+S,¶6c¨ ´z+S,¶6c¨ Page 1151081-26 ´z+S,¶6c¨ ´z+S,¶6c¨